A submersible is a type of underwater vessel. Suppose a submersible starts at a depth of 40 feet below sea level, represented by –40 feet. The table shows the submersible's change in depth from one minute to the next. Time and Depth of Submersible
2:15 p. m.
2:16 p. m.
2:17 p. m.
2:18 p. m.
–40 feet
180 feet lower
175 feet lower
185 feet lower

Answer the questions to find the depth of the submersible after 3 minutes.
1. Write and evaluate a subtraction expression to find the depth of the submersible at 2:16 p. m.
Answer is 580, and the write and evaluate would be 580 - 185 - 175 = 220
2. Write and evaluate a subtraction expression to find the depth of the submersible at 2:17 p. m.

3. Write and evaluate a subtraction expression to find the depth of the submersible at 2:18 p. m.

4. If the submersible dove straight down, what is the distance between the submersible's starting position at 2:15 and its position at 2:18? Show your work